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United States Patent | 5,508,709 |
Krenz ,   et al. | April 16, 1996 |
An antenna for an electronic apparatus is located in a flip element of the apparatus housing. A transformer, having a winding in the flip element and a winding in the housing couples electromagnetic energy across the hinge while impedance matching and performing a balun function.
Inventors: | Krenz; Eric L. (Crystal Lake, IL); Phillips; James P. (Lake in the Hills, IL) |
Assignee: | Motorola, Inc. (Schaumburg, IL) |
Appl. No.: | 375339 |
Filed: | January 18, 1995 |
Current U.S. Class: | 343/702; 343/856; 343/865; 343/882; 455/575.7 |
Intern'l Class: | H01Q 001/24 |
Field of Search: | 343/702,820,821,822,850,855,856,865,882,722,749,866 455/89,90,347,348 |
4001830 | Jan., 1977 | Ishimaru et al. | 343/702. |
4313119 | Jan., 1982 | Garay et al. | 343/702. |
4471493 | Sep., 1984 | Schober | 343/702. |
4630061 | Dec., 1986 | Hately | 343/749. |
4644366 | Feb., 1987 | Scholz | 343/702. |
4651312 | Mar., 1987 | Honma et al. | 343/702. |
4862183 | Aug., 1989 | Blaese | 343/715. |
5014346 | May., 1991 | Phillips et al. | 343/702. |
5057847 | Oct., 1991 | Vaisanen | 343/702. |
5073761 | Dec., 1991 | Waterman et al. | 333/24. |
5170173 | Dec., 1992 | Krenz et al. | 343/702. |
5337061 | Aug., 1994 | Pye et al. | 343/702. |
Foreign Patent Documents | |||
0394714A3 | Oct., 1990 | EP. | |
2679086 | Jan., 1993 | FR. |